
body {
  width: 100vw;
  height: 100vh;

  display: flex;
  justify-content: center;
  align-items: center;
}

.App {
  text-align: center;
  margin: auto;
  padding: 10px 15px;

  display: flex;
  flex-direction: column;

  width: 14em;
  /* height: 4em; */

  background-color: black;
  box-shadow: 3px 3px 5px 1px #999;
  border-radius: 6px;
}

.timer {
  font-size: 3em;
  user-select: none;
}

.btns {
  display: flex;
  justify-content: space-around;
}

.btns > button {
  flex: 1 1;
  background-color: hsl(50, 100%, 68%);
  font-weight: bolder;
  color: #555;
  user-select: none;    
}

.btns > button:disabled {
  background-color: #aaa;
}

.btns > button:not(:first-child) {
  margin-left: 2px;

}